Sunday's strikes turned up the pressure on a fragile ceasefire brokered between Washington and Moscow, now in its sixth day, and make the cloudy situation in war-torn Syria even grayer.

It was not known who conducted Sunday's strikes, which the Syrian Observatory for Human Rights said were the first in Aleppo since the US-Russia-backed ceasefire took effect last Monday. At least one woman has died and many people have been wounded, some critically.

Russia has said the US-led coalition airstrikes that mistakenly killed dozens of Syrian troops on Saturday -- prompting a diplomatic firestorm -- put the ceasefire in jeopardy.

The strikes near Deir Ezzor Airport -- which the US says were intended to target ISIS but instead killed 62 Syrian soldiers, according to the Russian military -- sparked a furious row between the US and Russian ambassadors to the United Nations outside an emergency Security Council meeting.

The US has expressed regret for the strikes, while Australia, which says its planes were among a number of international aircraft involved in the operation, expressed condolences to the victims' families.

"We consider what happened as a natural result of the persistent refusal of the United States from the establishment of close cooperation with Russia in the fight against ISIS, Jabhat al-Nusra and other affiliated terrorist groups," the Russian Foreign Ministry said in a statement.

Bouthaina Shaaban, a political and media adviser to Syrian President Bashar al-Assad, told CNN's Becky Anderson that Syria is adhering to the truce and the US should start cooperating.

"I ask the United States if they truly mean to target terrorists, where is the problem in coordinating their efforts with Russia, with the Syrian-Arab army, with anyone who is targeting terrorists?" asked Shaaban.

"After all, this is the target for all of us, so why are they prolonging the agony of the Syrian people and allowing the terrorists, all this time, and all this space, to slaughter our people?" she said.

US regret for 'unintentional loss of life'

The strikes occurred Saturday in a part of eastern Syria that is not covered by the ceasefire. The US military acknowledged having carried out the strikes, but said they was targeting ISIS militants and that if strikes hit Syrian troops, it was by accident.

The US "relayed our regret through the Russian Federation for the unintentional loss of life of Syrian forces fighting ISIL," a senior US official told CNN late Saturday, adding that the US would continue to pursue compliance with the ceasefire agreement while targeting terror groups like ISIS, which are not covered by the truce.

Australia's Department of Defense said in a statement that Australian aircraft were involved in the attacks in Deir Ezzor, targeting "what was believed to be a Daesh fighting position that the Coalition had been tracking for some time."

It said bombing "ceased immediately" once Russian officials notified the coalition's Combined Air Operations Center that the targets may have been regime forces.

Russia and Syria said the strikes prove Washington and its allies are sympathetic to ISIS, which they say was able to briefly capture a Syrian position in the wake of the coalition attack.

The Russian military says 62 Syrian soldiers were killed in the strikes, according to state media, while the UK-based Syrian Observatory for Human Rights put the death toll at 83, with at least 120 soldiers wounded.

US, Russia in war of words

On the sidelines of an emergency UN Security Council meeting called on the matter, tempers were high.

Russia's permanent UN representative, Vitaly Churkin, questioned the timing of the strikes, two days before Russian-American coordination in the fight against terror groups in Syria was to begin.

"I have never seen such an extraordinary display of American heavy-handedness," he said, after abruptly leaving the meeting.

Churkin was upset with US ambassador Samantha Power, who lambasted Russia's support of the Syrian regime to the media outside the meeting while he was speaking.

Power angrily denounced the Russian call for the UN meeting, saying "even by Russia's standards, tonight's stunt -- a stunt replete with moralism and grandstanding -- is uniquely cynical and hypocritical."

If US-led coalition airstrikes did hit Syrian forces Saturday, it was unintentional and Washington regrets any loss of life, she said, before proceeding to list atrocities she said the Syrian regime has perpetuated during the five-year civil war.

Russian Foreign Ministry spokeswoman Maria Zakharova responded to her remarks on Facebook, saying Power would understand "the meaning of the word 'shame'" if she visited Syria and met the people living there in "a bloody experiment, with the active involvement of Washington."

US: Coalition conferred with Russia

A statement from US Central Command said the coalition conferred with the Russian military before the strike.

"The coalition airstrike was halted immediately when coalition officials were informed by Russian officials that it was possible the personnel and vehicles targeted were part of the Syrian military," US Central Command said.

A US official told CNN they broadly described the geographic area to the Russians -- as is customary -- before the strike but did not give a precise location. The coalition thought it was going after an ISIS tank position.

"Syria is a complex situation with various military forces and militias in close proximity, but coalition forces would not intentionally strike a known Syrian military unit," CENTCOM said.

Russia blames the United States

Syrian troops have been battling ISIS for years in Deir Ezzor, where the Islamist militants control most of the city.

On Sunday, the Sunni terror group shot down a regime warplane involved in an anti-ISIS operation in Deir Ezzor province, killing the pilot, state-run SANA news agency reported, citing a military source. The terror group claimed responsibility for the shootdown in a statement circulated online by the ISIS-affiliated Amaq agency.

Russia blamed the United States for failing to coordinate with them on Saturday's airstrikes, a Russian Defense Ministry spokesman told Sputnik.

ISIS militants launched an attack on the Syrian position after the airstrikes, Sputnik reported, citing the Russian Ministry of Defense.

The SANA news agency said the military was able to quickly regain control of the area.

Delicate ceasefire

The Syrian military said it viewed the strike as evidence the United States and the coalition support ISIS. It called the incident a serious and blatant aggression, SANA reported. Russia's Foreign Ministry had similar words, according to spokeswoman Zakharova.

The latest ceasefire has offered some respite from violence in the civil war, which has killed an estimated 430,000 people since 2011 and touched off an international refugee crisis. But there have been numerous reports of violations, and both the Russians and Americans have said the other party is not fulfilling its obligations.

The main focus of the ceasefire was to allow humanitarian aid to reach the Syrian people. But nearly a week after the ceasefire began, desperate populations in besieged areas are yet to receive aid, which has been held up on the Turkish border as humanitarian agencies await guarantees of safety from the warring parties.

Once the humanitarian relief was in, the Russians and Americans were meant to agree on targeting jihadist factions: Jabhat Fateh Al-Sham, the former al Qaeda affiliate in Syria, and ISIS. To do that, they are supposed to set up a Joint Implementation Center.

CNN military analyst Lt. Col. Rick Francona said it is not clear now what will happen.

"This might put in danger this Joint Implementation Center that the US and the Russians are supposed to set up in the next few days to coordinate just these kinds of strikes against ISIS and to prevent just what happened," he said Saturday.

Keep these in mind as you contemplate the direction of the American government over the past 50 years and especially since the Obama election.

The Goals of Communism

(as read into the congressional record January 10, 1963, from "The Naked Communist" by Cleon Skousen)

1. U.S. acceptance of coexistence as the only alternative to atomic war.

2. U.S. willingness to capitulate in preference to engaging in atomic war.

3. Develop the illusion that total disarmament of the United States would be a demonstration of moral strength.

4. Permit free trade between all nations regardless of Communist affiliation and regardless of whether or not items could be used for war.

5. Extension of long-term loans to Russia and Soviet satellites.

6. Provide American aid to all nations regardless of Communist domination.

7. Grant recognition of Red China. Admission of Red China to the U.N.

8. Set up East and West Germany as separate states in spite of Khrushchev's promise in 1955 to settle the German question by free elections under supervision of the U.N.

9. Prolong the conferences to ban atomic tests because the United States has agreed to suspend tests as long as negotiations are in progress.

10. Allow all Soviet satellites individual representation in the U.N.

11. Promote the U.N. as the only hope for mankind. If its charter is rewritten, demand that it be set up as a one-world government with its own independent armed forces. (Some Communist leaders believe the world can be taken over as easily by the U.N. as by Moscow. Sometimes these two centers compete with each other as they are now doing in the Congo.)

12. Resist any attempt to outlaw the Communist Party.

13. Do away with all loyalty oaths.

14. Continue giving Russia access to the U.S. Patent Office.

15. Capture one or both of the political parties in the United States.

16. Use technical decisions of the courts to weaken basic American institutions by claiming their activities violate civil rights.

17. Get control of the schools. Use them as transmission belts for socialism and current Communist propaganda. Soften the curriculum. Get control of teachers' associations. Put the party line in textbooks.

18. Gain control of all student newspapers.

19. Use student riots to foment public protests against programs or organizations which are under Communist attack.

20. Infiltrate the press. Get control of book-review assignments, editorial writing, policymaking positions.

21. Gain control of key positions in radio, TV, and motion pictures.

22. Continue discrediting American culture by degrading all forms of artistic expression. An American Communist cell was told to "eliminate all good sculpture from parks and buildings, substitute shapeless, awkward and meaningless forms."

27. Infiltrate the churches and replace revealed religion with "social" religion. Discredit the Bible and emphasize the need for intellectual maturity which does not need a "religious crutch."

28. Eliminate prayer or any phase of religious expression in the schools on the ground that it violates the principle of "separation of church and state."

29. Discredit the American Constitution by calling it inadequate, old-fashioned, out of step with modern needs, a hindrance to cooperation between nations on a worldwide basis.

30. Discredit the American Founding Fathers. Present them as selfish aristocrats who had no concern for the "common man."

31. Belittle all forms of American culture and discourage the teaching of American history on the ground that it was only a minor part of the "big picture." Give more emphasis to Russian history since the Communists took over.

32. Support any socialist movement to give centralized control over any part of the culture--education, social agencies, welfare programs, mental health clinics, etc.

33. Eliminate all laws or procedures which interfere with the operation of the Communist apparatus.

34. Eliminate the House Committee on Un-American Activities.

35. Discredit and eventually dismantle the FBI.

36. Infiltrate and gain control of more unions.

37. Infiltrate and gain control of big business.

38. Transfer some of the powers of arrest from the police to social agencies. Treat all behavioral problems as psychiatric disorders which no one but psychiatrists can understand.

39. Dominate the psychiatric profession and use mental health laws as a means of gaining coercive control over those who oppose Communist goals.

40. Discredit the family as an institution. Encourage promiscuity and easy divorce.

41. Emphasize the need to raise children away from the negative influence of parents. Attribute prejudices, mental blocks and retarding of children to suppressive influence of parents.

42. Create the impression that violence and insurrection are legitimate aspects of the American tradition; that students and special-interest groups should rise up and use united force to solve economic, political or social problems.

43. Overthrow all colonial governments before native populations are ready for self-government.

44. Internationalize the Panama Canal.

45. Repeal the Connally reservation so the United States cannot prevent the World Court from seizing jurisdiction over nations and individuals alike.